Federal income taxes are due April 15 of the year after the tax year ends. For the 2025 tax year, that means Wednesday, April 15, 2026, with no holiday adjustment.1Office of the Law Revision Counsel. 26 USC 6072 – Time for Filing Income Tax Returns Both your Form 1040 and any balance you owe share that single cutoff. When April 15 falls on a Saturday, Sunday, or legal holiday observed in the District of Columbia, the deadline moves to the next business day, which is why Emancipation Day has pushed the national date to April 17 or 18 in past years.2Office of the Law Revision Counsel. 26 U.S. Code 7503 – Time for Performance of Acts Where Last Day Falls on Saturday, Sunday, or Legal Holiday
A mailed return counts as timely if the envelope is postmarked by the deadline. Electronic filings need to be submitted before midnight in your time zone. If you owe money and don’t pay by April 15, penalties and interest start running even if you file the return on time.
What Happens If You Miss April 15
The IRS charges two separate penalties, and the more expensive one is the one people tend to overlook. The failure-to-file penalty runs 5% of the unpaid tax per month, capped at 25%.3Internal Revenue Service. Failure to File Penalty Once a return is more than 60 days overdue, a minimum penalty kicks in: for returns due in 2026, that floor is $525 or 100% of the unpaid tax, whichever is smaller.4Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges
The failure-to-pay penalty is far lower at 0.5% of the unpaid tax per month, also capped at 25%.5Internal Revenue Service. Failure to Pay Penalty When both apply in the same month, the failure-to-file rate drops to 4.5% so the combined charge stays at 5%.6Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax So if you can only do one thing by April 15, file the return. Filing on time and owing money costs 0.5% a month. Not filing at all costs ten times that.
Interest runs on top of the penalties. The rate is the federal short-term rate plus three points, which works out to 7% for the first quarter of 2026 and 6% for the second quarter.7Internal Revenue Service. Quarterly Interest Rates Interest compounds daily until the balance is paid.
One important exception: if the IRS owes you a refund, there is no penalty for filing late.8Internal Revenue Service. Help Yourself by Filing Past-Due Tax Returns The penalty clock only ticks when you owe money.
Filing an Extension to October 15
If you need more time to gather records, submit Form 4868 by April 15 for an automatic six-month extension. The filing deadline then moves to October 15.9Internal Revenue Service. Get an Extension to File Your Tax Return The form asks for your estimated total liability, what you have already paid, and the balance due.
The catch trips people up every year. An extension to file is not an extension to pay. Your tax bill is still due April 15, and the failure-to-pay penalty plus interest apply to anything unpaid on that date.9Internal Revenue Service. Get an Extension to File Your Tax Return If you expect to owe, send a payment with the extension request even if it is a rough estimate. Overpaying slightly and getting a small refund later is cheaper than months of accruing penalties.
Quarterly Estimated Tax Deadlines
Income that isn’t subject to withholding usually has to be covered by quarterly estimated payments. This applies to freelancers, independent contractors, landlords, and anyone with significant investment income. The four installments fall on the same dates each year:10Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
- First quarter: April 15
- Second quarter: June 15
- Third quarter: September 15
- Fourth quarter: January 15 of the following year
Each installment should be roughly 25% of your estimated annual tax. You can work out the amount on the Form 1040-ES worksheet, or pay online through the IRS website or IRS2Go app without mailing anything.11Internal Revenue Service. Estimated Taxes
Safe Harbor Rules
Miss a quarterly deadline and you get an underpayment penalty scaled to how much you shorted and how long the shortfall lasted. To avoid the penalty entirely, your total payments for the year need to hit one of two thresholds: 90% of what you actually owe for the current year, or 100% of what you owed last year. If your prior-year adjusted gross income was over $150,000 ($75,000 married filing separately), the prior-year threshold rises to 110%.12Internal Revenue Service. Estimated Tax – Individuals The prior-year safe harbor is usually easier to hit because the number is already fixed; the 90% test requires you to predict the current year accurately.
If You Live or Serve Abroad
U.S. citizens and resident aliens whose home and main place of business are outside the country get an automatic extension to June 15 for both filing and payment.13Internal Revenue Service. U.S. Citizens and Resident Aliens Abroad – Automatic 2-Month Extension of Time to File Military members stationed outside the country qualify too. Attach a statement to your return explaining which situation applied.14Internal Revenue Service. Publication 54, Tax Guide for U.S. Citizens and Resident Aliens Abroad Interest still accrues on any unpaid tax from April 15, even with the filing extension. Filing Form 4868 pushes the deadline further to October 15 if you still need it.
Military members serving in a combat zone or designated contingency operation get a much broader protection. The entire period of service in the zone, plus 180 days after departure, is essentially removed from the IRS calendar. Filing deadlines, payment deadlines, and penalty clocks all pause during that window.15Office of the Law Revision Counsel. 26 U.S. Code 7508 – Time for Performing Certain Acts Postponed by Reason of Service in Combat Zone or Contingency Operation Hospitalization for injuries received in the zone extends the suspension further.
Disaster Area Extensions
When FEMA declares a federal disaster, the IRS typically postpones filing and payment deadlines for affected taxpayers automatically. You don’t need to call or file a special form; if your address is in the designated area, the extension applies.16Internal Revenue Service. Disaster Assistance and Emergency Relief for Individuals and Businesses The postponement covers returns, payments, and estimated tax installments falling within the disaster period. Relief varies by event; the IRS publishes the specific replacement deadlines for each declared disaster on its website.17Internal Revenue Service. Tax Relief in Disaster Situations
If You Own a Business
Business returns don’t all share the April 15 individual date. Calendar-year partnerships (Form 1065) and S corporations (Form 1120-S) file by the 15th day of the third month after year end, which is March 16, 2026, for the 2025 tax year. Schedule K-1s to owners and shareholders are due the same day. Form 7004 grants an automatic six-month extension to September 15.18Internal Revenue Service. Starting or Ending a Business
Calendar-year C corporations (Form 1120) file by the 15th day of the fourth month after year end, April 15, 2026, with a Form 7004 extension available to October 15.19Internal Revenue Service. Publication 509, Tax Calendars Partnerships and S corporations file earlier because their income flows through to owners’ individual returns; getting K-1s out by mid-March gives individual filers time to work that income into their April 15 return.
How Long You Have to Claim a Refund
A refund doesn’t sit at the Treasury forever waiting for you. The general rule gives you three years from the date you filed the original return, or two years from the date you paid the tax, whichever is later, to claim a credit or refund.20Internal Revenue Service. Time You Can Claim a Credit or Refund If you never filed at all, the three-year window runs from the original due date of the return.
After that window closes, the money belongs to the U.S. Treasury. The IRS announces billions of dollars in unclaimed refunds each year from people who simply didn’t file. Filing an original or amended return within the three-year period is the only way to recover it.21Internal Revenue Service. File an Amended Return
If You Can’t Pay by the Deadline
Doing nothing is the most expensive choice. Even if you can’t cover the full balance, file your return on time to avoid the 5%-per-month failure-to-file penalty, and pay whatever you can with the return to shrink the base the smaller penalty and interest run on.
For the remainder, the IRS offers two formal payment plans.22Internal Revenue Service. Payment Plans – Installment Agreements A short-term plan lets you pay the full balance within 180 days, with no setup fee if you apply online, and it’s available if you owe less than $100,000 in combined tax, penalties, and interest. A long-term installment agreement stretches monthly payments over a longer period; setup fees range from $22 for a direct-debit agreement applied for online to $178 for a standard agreement applied for by phone or mail, with a fee waiver available for low-income taxpayers. Long-term plans are available if you owe $50,000 or less and have filed all required returns.
Both agreements keep the IRS from levying your bank accounts or wages while the plan is active. Penalties and interest still accrue on the unpaid balance, so paying faster saves real money. But a payment plan that costs a few hundred extra in interest beats letting a 25% failure-to-file penalty stack up.